The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References+ Details

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References+ Details

Regulatory Restrictions (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
Regulatory Restrictions (Narrative) (Details) (USD $)	Mar. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Reserve balances		$ 42,500,000	$ 26,000,000
Cash and due from banks held as collateral		1,100,000	1,100,000
Common stock dividends	40,000,000	26,513,000	24,361,000	30,380,000
Series T Preferred Stock [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Repurchase of preferred stock				100,000,000
Non-Voting Preferred Shares [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Repurchase of preferred stock		$ 100,000,000